/Engine/Source/Runtime/Landscape/Classes/LandscapeComponent.h
void UpdateDominantLayerBuffer ( int32 InComponentX1, int32 InComponentY1, int32 InComponentX2, int32 InComponentY2, int32 InCollisionMipLevel, int32 InWeightmapSizeU, int32 InDataLayerIdx, const [TArray](API\Runtime\Core\Containers\TArray)< uint8 * > & InCollisionDataPtrs, const [TArray](API\Runtime\Core\Containers\TArray)< [ULandscapeLayerInfoObject](API\Runtime\Landscape\ULandscapeLayerInfoObject) * > & InLayerInfos, uint8 * DominantLayerData )